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Clinical Microbiology 2008. Microorganisms as causative agents of infections in animals Companion animals: Dog and cat Horse Food animals Cattle and sheep.

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Presentation on theme: "Clinical Microbiology 2008. Microorganisms as causative agents of infections in animals Companion animals: Dog and cat Horse Food animals Cattle and sheep."— Presentation transcript:

1 Clinical Microbiology 2008

2 Microorganisms as causative agents of infections in animals Companion animals: Dog and cat Horse Food animals Cattle and sheep Pig Poultry

3 Infections of the.. Respiratory system Nervous system (CNS) Gastro-intestinal tract Urinary tract Genital systém Skin, soft tissues and wounds Joint and bones

4 Clinical microbiology (microbes and antimicrobials) Bacteriology and use of antibiotics and chemoterapeutics) Virology And use of antivirotics Mycology And use of antimycotics Use of vaccines

5 Clinical specimens Colleted from living animals not from necropsy

6 Characterisation of bacteria from clinical specimens Processing of a specimen Gram stain Cultivation Atmosphere (A/AN, A+CO2,AN,A) Culture media (solid:BA, MC agar,XLD agar, chocolate agar, liquid: broths) Identification G+ Gram- negative bacteria (oxidase, catalase, biochemical tests, serological tests to identify serovars

7 Further identification -Typing methods Serological tests are used for serotyping (E.coli O157 H7, E. coli O141 F4 S. Typhimurium O 1,4,5,12,H: i, 1,2 S. Enteritidis O1,9,12, H:g,m Bacteriophage typing (S. Typimurium DT 104)

8 Identification – subtyping methods DNA subtyping methods gene typing for virulence factors instead of toxin production E.coli P. multocida

9 Obligate anaerobic bacteria Bacteroides/Fusobacterium Porphyromonas Prevotella Clostridium perfringens Clostridium difficile

10 Metods for detection of non- cultured bacteria Microscopy PCR detection using various modifications PCR Nested PCR Real time PCR

11 Non-cultured bacterial genera and species Lawsonia intracellularis Chlamydophilla spp. Rickketsias Hemomycoplasmas: Mycoplasma hemosuis, M. hemofelis

12 G- bacterial species most frequently obsereved Psudomonas aeruginosa E. coli Other coliforms (Klebsiella, Enterobacter) Salmonella Pasteurella multocida Haemophilus spp. Actinobacillus spp.

13 G+ bacterial species most frequently obsereved Beta – haemolytic streptococci Staphylococcus aureus/S.intermedius Coagulase negative staphylococci Enterococci Clostridium perfringens

14 Zoonotic bacterial species Campylobacter jejuni, C.coli VTEC (verotoxigenic E.coli serogroup O157 Salmonella enterica (ST DT 104) Yersinia enterocolitica Streptococcus suis 2 Listeria moncytogenes

15 Mycotic infections Candida albicans Dermatophyta

16 Use of Antibiotics Antibiotic susceptibility testing MIC – minimum inhibitory concentrations Disc susceptibility test Etest Beta-lactamase test

17 Commonly used antibiotic Range of action: Very good Good Poor activity against particular bacteria Bacterial resistance mechanisms

18 Betalactams PENICILLINS Benzylpenicillin Aminopenicillins Ampicilin, amoxicilin

19 Cephalosporines 1 to 4 generation 1g: cephalotin 2g: cefuroxim 3g: ceftazidim 4g: cefquinom

20 Carbapenems Imipenem

21 Inhibitors of beta-lactamases Clavulanic acid Sulbactam Combination: co-amoxicillin

22 Glykopeptides Vancomycin Teicoplanin

23 Aminoglycosides Streptomycin Gentamicin

24 Macrolides Erytromycin Tylosin Tilmicosin

25 Lincosamides Lincomycine

26 Tetracyclines Oxytetracycline/Chlortetracycline Doxycycline

27 Amphenicols Chloramphenicol 2.gen. Florfenicol

28 Pleuromutilins (diterpens) Tiamulin 2gen. Valnemulin

29 Chemoterapeutics Sulfonamides Quinolones

30 Sulfonamides Sulfamethoxazol Co- trimoxazol

31 Quinolones Non fluorinated q. Oxolinic acid Fluorinated q. enrofloxacin

32 Infections of the Respiratory System Mirobes Pathogenesis (aspiration) Nasopharynx Pharynx (pharyngitis) Trachea Bronchi (bronchioli) Lungs -pneumonia Bronchopneumonia Pleura (pleuritis) Lung absces

33 Infection of the skin and sof tissues A breatch of the skin Via minor abrasions Hair follicles Surgical incision Wounds (traumatic, surgical)

34 Infections of the blood Bacteraemia - bacteria in the blood se detected by blood culture Transient (single episode) Intermittent Continuous


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